Catheter



FIG. 1 is an isometric view of a catheter showing my new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a catheter, as shown and described. 